Wireless communication method, apparatus and system

ABSTRACT

There are provided a wireless communication apparatus, method and system. The apparatus, at a first node, comprises: a transceiver, operative to transmit and/or receive radio signal; a circuitry, operative to measure one or more channel busy ratios for channel resource pools of the radio signal, and perform congestion control on the channel resource pools based on the measured channel busy ratios.

BACKGROUND 1. Technical Field

The present technology relates to wireless communication field, and moreparticular, to a wireless communication method, apparatus and system.

2. Description of the Related Art

Congestion control function is a mandatory requirement for equipmentsoperated in 5.9 GHz Intelligent Transport System (ITS) band in Europe,and third

Generation Partnership Project (3GPP) is going to specify the congestioncontrol function as well based on especially, vehicle to vehicle (V2V)discussion.

SUMMARY

One non-limiting and exemplary embodiment provides a wirelesscommunication method, apparatus and system for congestion control.

In one general aspect, there is provided an apparatus, at a first node,comprising: a transceiver, operative to transmit and/or receive radiosignal; a circuitry, operative to measure one or more channel busyratios for channel resource pools of the radio signal, and performcongestion control on the channel resource pools based on the measuredchannel busy ratios.

In another general aspect, there is provided a method, at a first node,operative to transmit and/or receive radio signal, the methodcomprising: measuring one or more channel busy ratios for channelresource pools of the radio signal, and performing congestion control onthe channel resource pools based on the measured channel busy ratios.

In another general aspect, there is provided a system, at a first node,comprising: a processor; a memory coupled with the processor, whenexecuted by the processor, to perform a method including: measuring oneor more channel busy ratios for channel resource pools of the radiosignal, and performing congestion control on the channel resource poolsbased on the measured channel busy ratios.

It should be noted that general or specific embodiments may beimplemented as a system, a method, an integrated circuit, a computerprogram, a storage medium, or any selective combination thereof.

Additional benefits and advantages of the disclosed embodiments willbecome apparent from the specification and drawings. The benefits and/oradvantages may be individually obtained by the various embodiments andfeatures of the specification and drawings, which need not all beprovided in order to obtain one or more of such benefits and/oradvantages.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 schematically shows an example of a wireless communicationscenario including a user equipment (UE) and a base station such aseNodeB (eNB).

FIG. 2 schematically shows a block diagram of a wireless communicationapparatus according to an embodiment of the present disclosure.

FIG. 3A schematically shows several subframes and the resource pools ofthe radio signal in the subframes.

FIG. 3B schematically shows an example for explaining a measuringoperation of the wireless communication apparatus according to theembodiment of the present disclosure.

FIG. 4 schematically shows an example for explaining another measuringoperation of the wireless communication apparatus according to anotherembodiment of the present disclosure.

FIG. 5 schematically shows an example for explaining another measuringoperation of the wireless communication apparatus according to anotherembodiment of the present disclosure.

FIG. 6 schematically shows an example for explaining another measuringoperation of the wireless communication apparatus according to anotherembodiment of the present disclosure.

FIGS. 7A-7D schematically show different congestion control actions fordifferent congestion situations.

FIG. 8 schematically shows an example for explaining a reportingoperation of the wireless communication apparatus according to anembodiment of the present disclosure.

FIG. 9A schematically shows a flow chart of a wireless communicationmethod according to an embodiment of the present disclosure.

FIG. 9B schematically shows a flow chart of a wireless communicationmethod according to another embodiment of the present disclosure.

FIG. 9C schematically shows a flow chart of a wireless communicationmethod according to another embodiment of the present disclosure.

FIG. 10 schematically shows a block diagram of a wireless communicationsystem according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

Embodiments will now be described with reference to FIGS. 3 through 6,which relate to a communication method, apparatus and system. It isunderstood that the present technology may be embodied in many differentforms and in many different orders and should not be construed as beinglimited to the embodiments set forth herein. Rather, these embodimentsare provided so that this disclosure will be thorough and complete andwill fully convey the present technology to those skilled in the art.Indeed, the present technology is intended to cover alternatives,modifications and. equivalents of these embodiments, which are includedwithin the scope and spirit of the technology as defined by the appendedclaims. Furthermore, in the following detailed description of thepresent technology, numerous specific details are set forth in order toprovide a thorough understanding of the present technology. However, itwill be clear to those of ordinary skill in the art that the presenttechnology may be practiced without such specific details.

While orders of the steps of the methods and the structures of thecomponents are provided herein for exemplary purposes, but not forlimitation. The foregoing detailed description of the technology hasbeen presented for purposes of illustration and description. It is notintended to be exhaustive or to limit the technology to the precise formdisclosed. Many modifications and variations are possible in light ofthe above teaching. The described embodiments were chosen in order tobest explain the principles of the technology and its practicalapplication to thereby enable others skilled in the art to best utilizethe technology in various embodiments and with various modifications asare suited to the particular use contemplated. It is intended that thescope of the technology be defined by the claims appended hereto.

FIG. 1 schematically shows an example of a wireless communicationscenario including a user equipment (UE) and a base station such aseNodeB (eNB).

In a wireless communication scenario, when two user equipment (UE)terminals (e.g., mobile communication devices) of a wirelesscommunication network communicate with each other, their data pathtypically goes through an operator network. The data path through thenetwork may include base stations (such as eNB) and/or gateways. If thedevices are in close proximity with each other, their data path may berouted locally through a local base station. The data path from the UEto the eNB is called generally as an uplink channel or uplink (or UL forshort), and the data path from the eNB to the UE is called generally asa downlink channel or downlink (or DL for short).

It is also possible for two UE terminals in close proximity to eachother to establish a direct link or communication without going througha base station such as eNB. Telecommunications systems may usedevice-to-device (“D2D”) communication or vehicle-to-vehicle (“V2V”), inwhich two or more UE terminals directly communicate with one another. Inthe D2D or V2V communication, voice and/or data traffic (referred toherein as “user traffic or user data”) from one UE terminal to one ormore other UE terminals may not be communicated through a base stationor other network control device of a telecommunication system. D2D orV2V communication has more recently also become known as “sidelinkdirect communication” or even “sidelink” communications, and accordinglyis sometimes abbreviated as “SLD” or “SL”. As such, D2D or V2V, sidelinkdirect, and sidelink, or sidelink channel are used interchangeablyherein but all have the same meaning.

At present, in order to allocate and manage radio resources forperforming the wireless communication, a solution for allocating andrecovering radio resources in a Physical Uplink Control Channel (PUCCH)is provided in the related art. Taking the allocation of SchedulingRequest (SR) resources in the PUCCH as an example, the solution is asfollows: a radio resource manager of a base station generates a resourcepool; when a UE accesses a network, the radio resource manager searchesthe resource pool to allocates a resource being unused to the UE uponfinding it, and sets the resource to be in the in-use state; and whenthe UE releases the resource, the radio resource manager sets theresource to be in the not-in-use state.

However, the above solution for allocating resources stores the in-useresources and the not-in-use resources in a mixed manner in the abovesolution for allocating resources, and does not distinguish differentresource types, so the congestion control is performed with respect toall the resources as an entirety, therefore, an improved solution forbetter resource allocation and congestion control is required.

FIG. 2 schematically shows a block diagram of a wireless communicationapparatus 200 according to an embodiment of the present disclosure.

The wireless communication apparatus 200 at a first node according tothe embodiment of the present disclosure includes a transceiver 201,operative to transmit and/or receive radio signal; a circuitry 202,operative to measure one or more channel busy ratios (CBRs) for channelresource pools of the radio signal, and perform congestion control onthe channel resource pools based on the measured one or more channelbusy ratios.

CBR proposed herein generally means how many resources are occupied toreflect congestion situation in the wireless communication, and it canbe observed at both UE side and eNB side By measuring the CBR, the UE oreNB could take relevant actions for congestion control based on a degreeof the CBR. Therefore, the CBR measurement is a basis for congestioncontrol.

This embodiment can measure a CBR of the whole bandwidth including allD2D or WV resource pools. Then relevant actions can be taken based onthe CBR measurement Thus, congestion situation can be controlled andbalanced.

Furthermore, in order to distinguish situations of transmission Mode 1and transmission Mode 2, or Scheduling Assignment (SA) and data asdefined in 3GPP so as to do refined actions, and to know whether SAresource (or generally speaking, control channel resource) pool or dataresource (or generally speaking, data channel resource) pool iscongested, in an embodiment, the circuitry 202 may be operative tomeasure channel busy ratios for different types of channel resourcepools of the radio signal respectively, and perform congestion controlon the different types of channel resource pools based on the measuredchannel busy ratios.

Thus, in order to obtain improved congestion control result, with thesolution according to the embodiment of the disclosure, the circuitry202 can measure CBRs for different types of channel resource pools ofthe radio signal respectively, and perform congestion control on thedifferent types of channel resource pools based on the measured channelbusy ratios. Thus, each CBR for each type of channel resource pool canbe measured separately, and the congestion situation for each type ofchannel resource pool can be clearly known, and a distinctive and uniquecongestion control can be performed particularly with respect to thistype of channel resource pool. Therefore, such congestion control can bemore accurate and efficient.

In this case, firstly, certain resource pool's congestion can beimproved separately, in the case that the average congestion for theentire bandwidth may not tell details about different types of resourcepools. And secondly, congestion situations can be observed for each typeof resource pool, relevant actions can be taken for each type ofresource pool. Thirdly, it may save power for measuring all the resourcepools each time.

In an embodiment, the CBR can be measured by calculating a ratio ofoccupied number of resources to a total number of resources. Theoccupied number of resources indicates a number of calculation units ofradio signal which have powers larger than a threshold, and the totalnumber of resources indicates a total number of the calculation units ofradio signal.

As an example but not for limitation, the CBR can be measured by thefollowing formula (1)

CBR=occupied number/total number   formula (1)

The occupied number indicates a number of calculation units of radiosignal which have powers larger than a threshold as mentioned above, andthe total number indicates a total number of the calculation units ofradio signal as mentioned above.

In an embodiment, the calculation units of radio signal may include oneor more physical resource blocks (PRBs), or one or more resource blockgroups (RBGs) or other units for calculating the powers, and the powersmay include radio signal power strength, or power spectrum density orothers for evaluating the power degree or usage degree.

In an embodiment, the different types of channel resource pools of theradio signal may include a control channel resource pool, and a datachannel resource pool, and the circuitry may be operative to measure afirst channel busy ratio for the control channel resource pool andmeasure a second channel busy ratio for the data channel resource pool.

FIG. 3A schematically shows several subframes and the resource pools ofthe radio signal in the subframes.

The conception of a resource pool is defined in 3GPP specifications andit includes time/frequency resources which transmit the same type ofchannels. Currently in 3GPP Rel.12/13 specifications, SA data resourcepool and data resource pool are defined. To extend the usage to V2V,data and SA resource pools could be defined as well in V2Vimplementations. And as SA and data could be transmitted in the samesubframe based on V2V agreements in 3GPP RAN1, SA and data resourcepools could be configured in the same subframe as well, as shown in FIG.3A. UEs at the transmission Mode 1 and Mode 2 will take the same usageof the resources.

In an embodiment, the control channel resource pool may be a resourcepool including resources used for transmitting or receiving controlchannels (carrying control radio signaling), and which could be used totransmit SA, or Sidelink Control Channel (PSCCH). And the data channelresource pool may be a resource pool including resources used fortransmitting or receiving user traffic or user data (or user load), andwhich could also exampled as Physical Sidelink Shared Channel (PSSCH)from 3GPP physical protocol point of view.

FIG. 3B schematically shows an example for explaining such measuringoperation of the wireless communication apparatus according to theembodiment of the present disclosure.

As shown in FIG. 3B, the different types of channel resource pools ofthe radio signal may include a SA channel resources pool (shown as SA inthe drawings), and a data channel resource pool (shown as data in thedrawings). The circuitry 202 as shown in FIG. 2 may be operative tomeasure a first channel busy ratio (CBR1) for the SA channel resourcepool and measure a second channel busy ratio (CBR2) for the data channelresource pool respectively and separately.

As such, each CBR for each type of channel resource pool can be measuredseparately, and a distinctive and unique congestion control can beperformed particularly with respect to this type of channel resourcepool. Therefore, such congestion control can be more accurate andefficient.

In an embodiment, the first node may be operating at one of differenttransmission modes, and the circuitry may be operative to measure thechannel busy ratios for different types of channel resource pools of theradio signal respectively with respect to the different transmissionmodes.

In an embodiment, the different transmission modes may include a firsttransmission mode (for example Mode 1 as defined in 3GPP, in whichtransmission is based on base station scheduling) and a secondtransmission mode (for example Mode 2 as defined in 3GPP, which is auser equipment autonomous resource allocation mode). Although twotransmission modes are exemplified herein, the number of thetransmission modes is not limited to two, but may be other numbers.

In this case, FIG. 4 schematically shows an example for explaininganother measuring operation of the wireless communication apparatusaccording to another embodiment of the present disclosure.

As shown in FIG. 4, the circuitry may be operative to measure the CBRsfor different types of channel resource pools of the radio signalrespectively with respect to the different transmission modes, forexample, measure a CBR1 for the SA resource pool in Mode 1 resources,and measure a CBR2for the data resource pool in Mode 1 resources, andmeasure a CBR3 for the SA resource pool in Mode 2 resources, and measurea CBR4 for the data resource pool in Mode 2 resources.

As such, each CBR for each type of channel resource pool at differenttransmission modes can be measured separately, and a distinctive andunique congestion control can be performed particularly with respect tothis type of channel resource pool at this transmission mode. Therefore,such congestion control can be more accurate and efficient.

FIG. 5 schematically shows an example for explaining another measuringoperation of the wireless communication apparatus according to anotherembodiment of the present disclosure.

In this embodiment, it is assumed that the different transmission modesinclude a first transmission mode (for example Mode 1 as defined in 3GPPin which transmission is based on base station scheduling) and a secondtransmission mode (for example Mode 2 as defined in 3GPP that is a userequipment autonomous resource allocation mode).

in the case that the first node is operating at the first transmissionmode, for example Mode 1, the circuitry 202 may be operative to measurethe first channel busy ratio, CBR1, for the control channel resourcepool for the first transmission mode and measure the second channel busyratio, CBR2 for the data channel resource pool for the firsttransmission mode, Mode 1.

As such, UEs at Mode 1 only measure CBRs including the CBR for thecontrol channel resource pool and the CBR for the data channel resourcepool resources at Mode 1, without measuring CBRs for the control channelresource pool and the data channel resource pool resources at Mode 2 soas to save power consumption and increase efficiency While maintainingaccurate CBR measurement and congestion control.

On the other hand, In the case that the first node is operating at thesecond transmission mode, for example Mode 2, the circuitry 202 may beoperative to measure the third channel busy ratio, CBR3, for the controlchannel resource pool for the second transmission mode and measure thefourth channel busy ratio, CBR4 for the data channel resource pool forthe second transmission mode, Mode 2.

As such, UEs at Mode 2 only measure CBRs including the CBR for thecontrol channel resource pool and the CBR for the data channel resourcepool resources at Mode 2, without measuring CBRs for the control channelresource pool and the data channel resource pool resources at Mode 1 soas to save power consumption and increase efficiency while maintainingaccurate CBR measurement and congestion control.

FIG. 6 schematically shows an example for explaining another measuringoperation of the wireless communication apparatus according to anotherembodiment of the present disclosure.

In the embodiment, in the case that the radio signal is of a pluralityof carriers in frequency domain, the circuitry 202 may be operative tomeasure the channel busy ratios for the different types of channelresource pools for each carrier.

As shown in FIG. 6, it is assumed that the radio signal is formed ofcarrier component 1 (CC1), carrier component 2 (CC2), and carriercomponent 3 (CC3). The circuitry 202 may be operative to measure a CBR1including the CBR for the control channel resource pool and the CBR forthe data channel resource pool resources with respect to the carrierCC1, and measure a CBR2 including the CBR for the control channelresource pool and the CBR for the data channel resource pool resourceswith respect to the carrier CC2, and measure a CBR3 including the CBRfor the control channel resource pool and the CBR for the data channelresource pool resources with respect to the carrier CC3, respectively.

From above method that CBR is measured per CC, more accurate CBRmeasurement and congestion control could be obtained, and powerconsumption can also be saved.

After the CBRs are measured, the measured CBR can be compared to apredetermined threshold to determine a congestion situation. Thepredetermined threshold could be specified, preconfigured or RRCconfigured.

In the case that one or more of the channel busy ratios exceed thepredetermined threshold, the circuitry 202 may be operative to instructthe transceiver 201 to transmit radio signal not in unoccupied resourcesin one or more of the different types of channel resource poolscorresponding to the one or more of the channel busy ratios. Herein, theone or more of the different types of channel resource poolscorresponding to the one or more of the channel busy ratios indicatesthe channel resource pool whose channel busy ratio exceeds thepredetermined threshold, and is also called congested channel resourcepool.

Such action of transmitting radio signal not in unoccupied resourcesincludes one or more of: transmitting radio signal in occupied resourcesfor data with a priority lower than a priority of the radio signal to betransmitted; transmitting radio signal in occupied resources by droppingdata occupying the occupied resources; transmitting radio signal byadjusting radio parameters for the radio signal; and delaying apredetermined time to transmit radio signal, and other actions for notoccupying the occupied resources in the congested resource pool. In anembodiment, the radio parameters for the radio signal may include one ormore of power and number of transmissions of a transport block or otherparameters. In this case, the priority of the radio signal could bespecified or RRC configured.

In the case that one or more of the channel busy ratios do not exceed apredetermined threshold, the circuitry 202 may be operative to instructthe transceiver to transmit radio signal in unoccupied resources in theone or more of the different types of channel resource poolscorresponding to the one or more of the channel busy ratios.

To be noted that in the case of the specific examples, Mode 1 and Mode 2as defined in 3GPP, and in the case that the first node is the UE, sincethe eNB is in charge of schedule and congestion control when the UE isat Mode 1, after measuring the CBRs for Mode 1 at the UE side and themeasurement is reported to the eNB, the eNB is to instruct the UE(including the circuitry 202 at the UE) to (instruct the transceiver to)transmit the radio signal not in unoccupied resources, or transmit theradio signal in unoccupied resources. On the other hand, the UE itselfcan be in charge of schedule and congestion control when the UE is atMode 2, so after measuring the CBRs for Mode 2, the UE (including thecircuitry 202 at the UE) can instruct the transceiver to transmit theradio signal not in unoccupied resources, or transmit the radio signalin unoccupied resources.

However, which is in charge of schedule and congestion control and whichwill send the instructions is not a limitation, but in some embodiments,as long as there are different transmission modes, and CBRs for thedifferent the transmission modes are measured respectively, the specificcongestion control can be performed on the first node to realize effectsincluding power consumption saving, accurate congestion control and soon, no matter who is in charge of schedule and congestion control.

FIGS. 7A-7D schematically show different congestion control actions fordifferent congestion situations.

The different congestion situations can be divided according to both ofthe congested situation of the control channel resource pool and thecongested situation of the data channel resource pool.

As shown in FIGS. 7A-7D, the term “congested” indicates that the channelbusy ratios exceeds (i.e., is larger than or equal to) the predeterminedthreshold, and the term “not congested” indicates that the channel busyratios does not exceed (i.e., is less than) the predetermined threshold.

In FIG. 7A, the SA resource pool is not congested and the data resourcepool is congested based on the CBR measurement. Based on theabove-mentioned straightforward solution in which that the CBR ismeasured based on the whole bandwidth without distinctively measuringeach CBR for each type of resource pool, the CBR level may be low, sodata will be transmitted in unoccupied resources in the data resourcepool. However, such behavior will cause heavier congestion situation fordata transmission especially in the case that the data channel resourcepool is already congested.

Based on the proposal of the embodiments of the present disclosure thatCBRs for SA and data are separately measured, it can be clearly knownthat the SA resource pool is not congested and the data resource pool iscongested, even if the whole congestion situation for the wholebandwidth is still not congested. So different actions can be taken forSA and data resource pools by:

1. for the data channel resource pool, preempting lower priority packetsfor data transmission in the occupied resources in the data channelresource pool as the CBR of data is high and the data channel resourcepool is congested. It does not need to transmit the packets inunoccupied resources further; and2. for the SA channel resource pool, the data can be transmitted inunoccupied resources in the SA channel resource pool as the CBR of SA islow, and the SA channel resource pool is not congested.

By doing so, the SA resource pool's utilization is improved, andcongestion situation of the data resource pool does not become worse.Each resource pool's utilization can be optimized to obtain an improvedcongestion control on each of the whole resource pools.

In this example, preemption means transmitting radio signal in occupiedresources for data with a priority lower than a priority of the radiosignal to be transmitted, which is mentioned for congestion control.Other possibilities are also possible, including for example,transmitting radio signal in occupied resources by dropping dataoccupying the occupied resources; transmitting radio signal by adjustingradio parameters for the radio signal; and delaying a predetermined timeto transmit radio signal, and others.

In FIG. 7B, the SA resource pool is congested and the data resource poolis not congested based on the CBR measurement.

Based on the proposal of the embodiments of the present disclosure thatCBRs for SA and data are separately measured, it can be clearly knownthat the SA resource pool is congested and the data resource pool is notcongested, even if the whole congestion situation for the wholebandwidth is still not congested. So different actions can be taken forthe SA and data resource pools by:

1. for the SA channel resource pool, preempting lower priority packetsfor data transmission in the occupied resources in the SA channelresource pool as the CBR of SA is high and the SA channel resource poolis congested. It does not need to transmit the packets in unoccupiedresources further; and2. for the data channel resource pool, the data can be transmitted inunoccupied resources in the data channel resource pool as the CBR ofdata is low, and the data channel resource pool is not congested.

By doing so, the data resource pool's utilization is improved, andcongestion situation of the SA resource pool does not become worse. Eachresource pool's utilization can be optimized to obtain an improvedcongestion control on each of the whole resource pools.

In FIG. 7C, the SA resource pool is congested and the data resource poolis also congested based on the CBR measurement.

Based on the proposal of the embodiments of the present disclosure thatCBRs for SA and data are separately measured, it can be clearly knownthat the SA resource pool is congested and the data resource pool isalso congested. So actions can be taken for the SA and data resourcepools by:

For both the SA channel resource pool and the data channel resourcepool, preempting lower priority packets for data transmission in theoccupied resources in both the SA channel resource pool and the datachannel resource pool as the CBRs of SA and data are both high.

By doing so, the congestion situation of the SA and data resource poolsdoes not become worse.

In FIG. 7D, the SA resource pool is not congested and the data resourcepool is not congested based on the CBR measurement.

Based on the proposal of the embodiments of the present disclosure thatCBRs for SA and data are separately measured, it can be clearly knownthat the SA resource pool is not congested and the data resource pool isnot congested. So actions can be taken for the SA and data resourcepools by:

For both the SA and data channel resource pools, the data can betransmitted in unoccupied resources in both the SA and data channelresource pools as the CBRs of SA and data are both low.

By doing so, both the data and SA resource pools' utilization isimproved.

FIG. 8 schematically shows an example for explaining a reportingoperation of the wireless communication apparatus according to anembodiment of the present disclosure.

CBR can be measured at the eNB side and the UE does not report it. Butthe eNB side cannot know interference situation at the UEs, so theobserved CBR value at the eNB side may be too conservative, because someoccupied resources may still be used for other UEs if there is nointerference or small interference to each other due to large distance.

So, as proposed in this embodiment, the transceiver 201 at the firstnode may be operative to report the measured channel busy ratios to asecond node, and the first node may be a user equipment (UE), and thesecond node may be a base station (eNB), That is, the UE sides measureCBRs, and report them to the eNB side.

As shown in FIG. 8, based on the eNB observation, the CBR is 50% as oneresource is allocated for UE1 and another resource is allocated to UE2.But at the UE side, a UE1's transmission does not interfere with a UE2,so the relevant resource (the left upper resource as shown) could stillbe used for transmission by UE2. Therefore, CBR observed by the UE2 is25%, which is lower than the observation of the eNB. In this case, theobservation at the UE side is more accurate.

The benefit of UEs reporting CBRs to the eNB is that the UEs can observethe CBRs more accurately, so the congestion controls on each type of thechannel source pool can be more accurate and efficient.

In an embodiment, the transceiver 201 at UE side may be operative toreport the measured channel busy ratios, CBRs, to the eNB in response toone of the following conditions: a predetermined period elapses (i.e.,periodically); at least one of the measured channel busy ratios exceedsa predetermined threshold; or the reporting is triggered by the basestation, i.e., eNB.

Then, detailed congestion control can be done at eNB side, for example,but not limited to:

1. the eNB could adjust the SA or data resource pools based on thereported CBRs of the SA and data respectively.2. the eNB could adjust congestion situation by scheduling s lingcertain lower priority packets of certain UEs).

The benefit of eNB performing the detailed congestion control is thatthe eNB can know better about congestion situation on the whole UEs,compared with congestion control totally relying on eNB implementation.The spectral efficiency can be improved.

Thus, with the embodiments of the present disclosure, each CBR for eachtype of channel resource pool can be measured separately, and thecongestion situation for each type of channel resource pool can beclearly known, and a distinctive and unique congestion control can beperformed particularly with respect to this type of channel resourcepool. Therefore, such congestion control can be more accurate andefficient.

In another embodiment, the wireless communication apparatus 200 at afirst node according to the embodiment of the present disclosureincludes a transceiver 201, operative to transmit and/or receive radiosignal; a circuitry 202, operative to measure one or more channel busyratios (CBRs) for channel resource pools of the radio signal, andperform congestion control on the channel resource pools based on themeasured one or more channel busy ratios. And the first node may beoperating at one of different transmission modes, and the circuitry 202may be operative to measure the channel busy ratios for the channelresource pools of the radio signal with respect to the differenttransmission modes.

In this embodiment, each CBR for each transmission mode can be measuredseparately, and the congestion situation for each transmission mode canbe clearly known, and a distinctive and unique congestion control can beperformed particularly with respect to UEs at each transmission mode.Therefore, such congestion control can be more accurate and efficient.

In another embodiment, the wireless communication apparatus 200 at afirst node according to the embodiment of the present disclosureincludes a transceiver 201, operative to transmit and/or receive radiosignal; a circuitry 202, operative to measure one or more channel busyratios (CBRs) for channel resource pools of the radio signal, andperform congestion control on the channel resource pools based on themeasured one or more channel busy ratios. And in the case that the radiosignal is of a plurality of carriers, the circuitry 202 may be operativeto measure the channel busy ratios for the channel resource pools foreach carrier.

In this embodiment, each CBR for each carrier can be measuredseparately, and the congestion situation for each carrier can be clearlyknown, and a distinctive and unique congestion control can be performedparticularly with respect to each carrier. Therefore, such congestioncontrol can be more accurate and efficient.

FIG. 9A schematically shows a flow chart of a wireless communicationmethod 900 according to an embodiment of the present disclosure.

The method 900, at a first node, comprises: step S901, measuring channelbusy ratios for different types of channel resource pool of the radiosignal respectively; and step S902 performing congestion control on thedifferent types of channel resource pools based on the measured channelbusy ratios.

Thus, each CBR for each type of channel resource pool can be measuredseparately, and the congestion situation for each type of channelresource pool can be clearly known, and a distinctive and uniquecongestion control can be performed particularly with respect to thistype of channel resource pool. Therefore, such congestion control can bemore accurate and efficient.

In an embodiment, the different types of channel resource pools of theradio signal may include a control channel resource pool and a datachannel resource pool, and the step S901 may include measuring a firstchannel busy ratio for the control channel resource pool and measuring asecond channel busy ratio for the data channel resource pool.

In an embodiment, the first node may be operating at one of differenttransmission modes, and the step S901 may include measuring the channelbusy ratios for different types of channel resource pools of the radiosignal respectively with respect to the different transmission modes.

In an embodiment, the different transmission modes may include a firsttransmission mode in which transmission is based on base stationscheduling and a second transmission mode that is a user equipmentautonomous resource allocation mode. In the case that the first node isoperating at the first transmission mode, the step S901 may includemeasuring the first channel busy ratio for the control channel resourcepool for the first transmission mode and measuring the second channelbusy ratio for the data channel resource pool for the first transmissionmode.

In an embodiment, the different transmission modes may include a firsttransmission mode and a second transmission mode. In the case that thefirst node is operating at the second transmission mode, the step S901may include measuring the first channel busy ratio for the controlchannel resource pool for the second transmission mode and measuring thesecond channel busy ratio for the data channel resource pool for thesecond transmission mode.

In an embodiment, in the case that the radio signal is of a plurality ofcarriers, the step S901 may include measuring the channel busy ratiosfor the different types of channel resource pools for each carrier.

In an embodiment, in the case that one or more of the channel busyratios exceed a predetermined threshold, the step S902 may includetransmitting radio signal not in unoccupied resources in one or more ofthe different types of channel resource pools corresponding to the oneor more of the channel busy ratios.

In an embodiment, in the case that one or more of the channel busyratios exceed a predetermined threshold, the step S902 may include oneor more of: transmitting radio signal in occupied resources for datawith a priority lower than a priority of the radio signal to betransmitted; transmitting radio signal in occupied resources by droppingdata occupying the occupied resources; transmitting radio signal byadjusting radio parameters for the radio signal; and delaying apredetermined time to transmit radio signal.

In an embodiment, the radio parameters for the radio signal may includeone or more of power and number of transmissions of a transport block.

In an embodiment, in the case that one or more of the channel busyratios do not exceed a predetermined threshold, the step S902 mayinclude transmitting radio signal in unoccupied resources in the one ormore of the different types of channel resource pools corresponding tothe one or more of the channel busy ratios.

In an embodiment, the method 900 may further include a step of reportingthe measured channel busy ratios to a second node, wherein the firstnode is a user equipment, and the second node is a base station.

In an embodiment, the step of reporting may include reporting themeasured channel busy ratios to a second node in response to one of thefollowing conditions: a predetermined period elapses; at least one ofthe measured channel busy ratios exceeds a predetermined threshold; orthe reporting is triggered by the base station.

In an embodiment, the step 902 may include measuring channel busy ratios(CBR) by calculating a ratio of occupied number of resources to a totalnumber of resources, wherein, the occupied number of resources indicatesa number of calculation units of radio signal which have powers largerthan a threshold, and the total number of resources indicates a totalnumber of the calculation units of radio signal.

In an embodiment, the calculation units of radio signal may include oneor more physical resource blocks, or one or more resource block groups,and wherein the powers include radio signal power strength, or powerspectrum density.

In an embodiment, the control channel resource pool may include aPhysical Sidelink Control Channel (PSCCH) resource pool, and the datachannel resource pool may include a Physical Sidelink Shared Channel(PSSCH) resource pool.

Thus, with the embodiments of the present disclosure, each CBR for eachtype of channel resource pool can be measured separately, and thecongestion situation for each type of channel resource pool can beclearly known, and a distinctive and unique congestion control can beperformed particularly with respect to this type of channel resourcepool. Therefore, such congestion control can be more accurate andefficient.

FIG. 9B schematically shows a flow chart of a wireless communicationmethod 900′ according to another embodiment of the present disclosure.

The method 900′, at a first node, comprises: step S901′, measuring oneor more channel busy ratios for channel resource pools of the radiosignal with respect to different transmission modes; and step S902′performing congestion control on the different types of channel resourcepool based on the measured channel busy ratios.

In this embodiment, each CBR for each transmission mode can be measuredseparately, and the congestion situation for each transmission mode canbe clearly known, and a distinctive and unique congestion control can beperformed particularly with respect to UEs at each transmission mode.Therefore, such congestion control can be more accurate and efficient.

FIG. 9C schematically shows a flow chart of a wireless communicationmethod 900″ according to another embodiment of the present disclosure.

The method 900″, at a first node, comprises: step S901″, measuring oneor more channel busy ratios for channel resource pools of the radiosignal with respect to different transmission modes; and step S902″performing congestion control on the different types of channel resourcepool based on the measured channel busy ratios.

In this embodiment, each CBR for each carrier can be measuredseparately, and the congestion situation for each carrier can be clearlyknown, and a distinctive and unique congestion control can be performedparticularly with respect to each carrier. Therefore, such congestioncontrol can be more accurate and efficient.

FIG. 10 schematically shows a block diagram of a wireless communicationsystem 1000 according to an embodiment of the present disclosure.

The system 1000, at a first node, comprises: a processor H1; a memory H2coupled with the processor, when executed by the processor, to perform amethod 900 including: step S901, measuring channel busy ratios fordifferent types of channel resource pools of the radio signalrespectively; and step S902, performing congestion control on thedifferent types of channel resource pools based on the measured channelbusy ratios.

In an embodiment, the different types of channel resource pools of theradio signal may include a control channel resource pool and a datachannel resource pool, and the step S901 may include measuring a firstchannel busy ratio for the control channel resource pool and measuring asecond channel busy ratio for the data channel resource pool.

In an embodiment, the first node may be operating at one of differenttransmission modes, and the step S901 may include measuring the channelbusy ratios for different types of channel resource pools of the radiosignal respectively with respect to the different transmission modes.

In an embodiment, the different transmission modes may include a firsttransmission mode in which transmission is based on base stationscheduling and a second transmission mode that is a user equipmentautonomous resource allocation mode. In the case that the first node isoperating at the first transmission mode, the step S901 may includemeasuring the first channel busy ratio for the control channel resourcepool for the first transmission mode and measuring the second channelbusy ratio for the data channel resource pool for the first transmissionmode.

In an embodiment, the different transmission modes may include a firsttransmission mode and a second transmission mode. In the case that thefirst node is operating at the second transmission mode, the step S901may include measuring the first channel busy ratio for the controlchannel resource pool for the second transmission mode and measuring thesecond channel busy ratio for the data channel resource pool for thesecond transmission mode.

In an embodiment, in the case that the radio signal is of a plurality ofcarriers, the step S901 may include measuring the channel busy ratiosfor the different types of channel resource pools for each carrier.

In an embodiment, in the case that one or more of the channel busyratios exceed a predetermined threshold, the step S902 may includetransmitting radio signal not in unoccupied resources in one or more ofthe different types of channel resource pools corresponding to the oneor more of the channel busy ratios.

In an embodiment, in the case that one or more of the channel busyratios exceed a predetermined threshold, the step S902 may include oneor more of: transmitting radio signal in occupied resources for datawith a priority lower than a priority of the radio signal to betransmitted; transmitting radio signal in occupied resources by droppingdata occupying the occupied resources; transmitting radio signal byadjusting radio parameters for the radio signal; and delaying apredetermined time to transmit radio signal.

In an embodiment, the radio parameters for the radio signal may includeone or more of power and number of transmissions of a transport block.

In an embodiment, in the case that one or more of the channel busyratios do not exceed a predetermined threshold, the step S902 mayinclude transmitting radio signal in unoccupied resources in the one ormore of the different types of channel resource pools corresponding tothe one or more of the channel busy ratios.

In an embodiment, the method 900 may further include a step of reportingthe measured channel busy ratios to a second node, wherein the firstnode is a user equipment, and the second node is a base station.

In an embodiment, the step of reporting may include reporting themeasured channel busy ratios to a second node in response to one of thefollowing conditions: a predetermined period elapses; at least one ofthe measured channel busy ratios exceeds a predetermined threshold; orthe reporting is triggered by the base station.

In an embodiment, the step 902 may include measuring channel busy ratios(CBRs) by calculating a ratio of occupied number of resources to a totalnumber of resources, wherein, the occupied number of resources indicatesa number of calculation units of radio signal which have powers largerthan a threshold, and the total number of resources indicates a totalnumber of the calculation units of radio signal.

In an embodiment, the calculation units of radio signal may include oneor more physical resource blocks, or one or more resource block groups,and wherein the powers include radio signal power strength, or powerspectrum density.

In an embodiment, the control channel resource pool may include aPhysical Sidelink Control Channel (PSCCH) resource pool, and the datachannel resource pool may include a Physical Sidelink Shared Channel(PSSCH) resource pool.

Thus, with the embodiments of the present disclosure, each CBR for eachtype of channel resource pool can be measured separately, and thecongestion situation for each type of channel resource pool can beclearly known, and a distinctive and unique congestion control can beperformed particularly with respect to this type of channel resourcepool. Therefore, such congestion control can be more accurate andefficient.

In addition, embodiments of the present disclosure can at least providethe following subject matters.

(1). An apparatus, at a first node, comprising:

a transceiver, operative to transmit and/or receive radio signal;a circuitry, operative to measure one or more channel busy ratios forchannel resource pools of the radio signal, and perform congestioncontrol on the channel resource pools based on the measured one or morechannel busy ratios.

(2) The apparatus according to (1), wherein,

a circuitry is operative to measure channel busy ratios for differenttypes of channel resource pools of the radio signal respectively, andperform congestion control on the different types of channel resourcepools based on the measured channel busy ratios.

(3). The apparatus according to (3), wherein, the different types ofchannel resource pools of the radio signal include a control channelresource pool and a data. channel resource pool, and

wherein the circuitry is operative to measure a first channel busy ratiofor the control channel resource pool and measure a second channel busyratio for the data channel resource pool.

(4). The apparatus according to (2), wherein, the first node isoperating at one of different transmission modes, and the circuitry isoperative to measure the channel busy ratios for different types ofchannel resource pools of the radio signal respectively with respect tothe different transmission modes.

(5). The apparatus according to (4), wherein, the different transmissionmodes include a first transmission mode in which transmission is basedon base station scheduling and a second transmission mode that is a userequipment autonomous resource allocation mode,

wherein in the case that the first node is operating at the firsttransmission mode, the circuitry is operative to measure the firstchannel busy ratio for the control channel resource pool for the firsttransmission mode and measure the second channel busy ratio for the datachannel resource pool for the first transmission mode.

(6). The apparatus according to (4), wherein, the different ransmissionmodes include a first transmission mode and a second transmission mode,

in the case that the first node is operating at the second transmissionmode, the circuitry is operative to measure the first channel busy ratiofor the control channel resource pool for the second transmission modeand measure the second channel busy ratio for the data channel resourcepool for the second transmission mode.

(7). The apparatus according to (2), wherein, in the case that the radiosignal is of a plurality of carriers, the circuitry is operative tomeasure the channel busy ratios for the different types of channelresource pools for each carrier.

(8). The apparatus according to (2), wherein, in the case that one ormore of the channel busy ratios exceed a predetermined threshold, theradio signal is not transmitted in unoccupied resources in one or moreof the different types of channel resource pools corresponding to theone or more of the channel busy ratios.

(9). The apparatus according to (8), wherein, the circuitry is operativeto instruct the transceiver to perform one or more of:

transmitting radio signal in occupied resources for data with a prioritylower than a priority of the radio signal to be transmitted;transmitting radio signal in occupied resources by dropping dataoccupying the occupied resources;transmitting radio signal by adjusting radio parameters for the radiosignal; anddelaying a predetermined time to transmit radio signal.

(10). The apparatus according to (9), wherein, the radio parameters forthe radio signal include one or more of power and number oftransmissions of a transport block.

(11). The apparatus according to (2), wherein, in the case that one ormore of the channel busy ratios do not exceed a predetermined threshold,the radio signal is transmitted in unoccupied resources in the one ormore of the different types of channel resource pools corresponding tothe one or more of the channel busy ratios.

(12). The apparatus according to (2), wherein, the transceiver isoperative to report the measured channel busy ratios to a second node,wherein the first node is a user equipment, and the second node is abase station.

(13). The apparatus according to (12), wherein, the transceiver isoperative to report the measured channel busy ratios to the second nodein response to one of the following conditions:

a predetermined period elapses;at least one of the measured channel busy ratios exceeds a predeterminedthreshold; orthe reporting is triggered by the base station.

(14). The apparatus according to (2), wherein, a circuitry, operative tomeasure channel busy ratios (CBRs) by calculating a ratio of occupiednumber of resources to a total number of resources,

wherein, the occupied number of resources indicates a number ofcalculation units of radio signal which have powers larger than athreshold, and the total number of resources indicates a total number ofthe calculation units of radio signal.

(15). The apparatus according to (14), wherein, the calculation units ofradio signal include one or more physical resource blocks, or one ormore resource block groups, and wherein the powers include radio signalpower strength, or power spectrum density.

(16). The apparatus according to (3), wherein the control channelresource pool includes a Physical Sidelink Control Channel (PSCCH)resource pool, and the data channel resource pool includes a PhysicalSidelink Shared Channel (PSSCH) resource pool.

(17), The apparatus according to claim 1, wherein the first node isoperating at one of different transmission modes, and the circuitry isoperative to measure the channel busy ratios for the channel resourcepools of the radio signal with respect to the different transmissionmodes.

(18). The apparatus according to claim 1, wherein in the case that theradio signal is of a plurality of carriers, the circuitry is operativeto measure the channel busy ratios for the channel resource pools toreach carrier.

(19). A method, at a first node, operative to transmit and/or receiveradio signal, the method comprising:

measuring one or more channel busy ratios for channel resource pools ofthe radio signal, andperforming congestion control on the channel resource pools based on themeasured one or more channel busy ratios.

(20). The method according to (19), wherein, the different types ofchannel resource pool of the radio signal include a control channelresource pool and a data channel resource pool, and

wherein the measuring includes measuring a first channel busy ratio forthe control channel resource pool and measuring a second channel busyratio for the data channel resource pool.

(21). The method according to (19), wherein, the first node is operatingat one of different transmission modes, and the measuring includesmeasuring the channel busy ratios for different types of channelresource pools of the radio signal respectively with respect to thedifferent transmission modes.

(22), The method according to (21), wherein, the different transmissionmodes include a first transmission mode in which transmission is basedon base station scheduling and a second transmission mode that is a userequipment autonomous resource allocation mode,

wherein in the case that the first node is operating at the firsttransmission mode, the measuring includes measuring the first channelbusy ratio for the control channel resource pool for the firsttransmission mode and measuring the second channel busy ratio for thedata channel resource pool for the first transmission mode.

(23). The method according to (21), wherein, the different transmissionmodes include a first transmission mode and a second transmission mode,

in the case that the first node is operating at the second transmissionmode, the measuring includes measuring the first channel busy ratio forthe control channel resource pool for the second transmission mode andmeasuring the second channel busy ratio for the data channel resourcepool for the second transmission mode.

(24). The method according to (19), wherein, in the case that the radiosignal is of a plurality of carriers, the measuring includes measuringthe channel busy ratios for the different types of channel resourcepools for each carrier.

(25). The method according to (19), wherein, in the case that one ormore of the channel busy ratios exceed a predetermined threshold, theperforming includes transmitting radio signal not in unoccupiedresources in one or more of the different types of channel resourcepools corresponding to the one or more of the channel busy ratios.

(26). The method according to (25), wherein, the includes one or moreof:

transmitting radio signal in occupied resources for data with a prioritylower than a priority of the radio signal to be transmitted;transmitting radio signal in occupied resources by dropping dataoccupying the occupied resources;transmitting radio signal by adjusting radio parameters for the radiosignal; and delaying a predetermined time to transmit radio signal.

(27). The method according to (25), wherein, the radio parameters forthe radio signal include one or more of power and number oftransmissions of a transport block.

(28). The method according to (19), wherein, in the case that one ormore of the channel busy ratios do not exceed a predetermined threshold,the performing includes transmitting radio signal in unoccupiedresources in the one or more of the different types of channel resourcepools corresponding to the one or more of the channel busy ratios.

(29). The method according to (19), wherein, the method furthercomprises reporting the measured channel busy ratios to a second node,wherein the first node is a user equipment, and the second node is abase station.

(30). The method according to (29), wherein, the method furthercomprises reporting the measured channel busy ratios to the second nodein response to one of the following conditions:

a predetermined period elapses;at least one of the measured channel busy ratios exceeds a predeterminedthreshold; orthe reporting is triggered by the base station.

(31). The method according to (19), wherein, the measuring includesmeasuring channel busy ratios (CBRs) by calculating a ratio of occupiednumber of resources to a total number of resources,

wherein, the occupied number of resources indicates a number ofcalculation units of radio signal which have powers larger than athreshold, and the total number of resources indicates a total number ofthe calculation units of radio signal.

(32), The method according to (31), wherein, the calculation units ofradio signal include one or more physical resource blocks, or one ormore resource block groups, and wherein the powers include radio signalpower strength, or power spectrum density.

(33). The method according to (20), wherein the control channel resourcepool includes a Physical Sidelink Control Channel (PSCCH) resource pool,and a data channel resource pool includes a Physical Sidelink SharedChannel (PSSCH) resource pool.

(34). The method according to (19), wherein the first node is operatingat one of different transmission modes, and the measuring includesmeasure the channel busy ratios for the channel resource pools of theradio signal with respect to different transmission modes.

(35). The method according to (19), Wherein in the case that the radiosignal is of a plurality of carriers, the measuring includes measuringthe channel busy ratios for the channel resource pools for each carrier.

(36). A system, at a first node, comprising:

a processor;a memory coupled with the processor, when executed by the processor, toperform a method including:measuring channel busy ratios for different types of channel resourcepools of the radio signal respectively, andperforming congestion control on the different types of channel resourcepools based on the measured channel busy ratios.

(37). The system according to (36), wherein, the different types ofchannel resource pool of the radio signal include a control channelresource pool and a data channel resource pool, and

wherein the measuring includes measuring a first channel busy ratio forthe control channel resource pool and measuring a second channel busyratio for the data channel resource pool.

(38). The system according to (36), wherein, the first node is operatingat one of different transmission modes, and the measuring includesmeasuring the channel busy ratios for different types of channelresource pools of the radio signal respectively with respect todifferent transmission modes.

(39). The system according to (38), wherein, the different transmissionmodes include a first transmission mode and a second transmission mode,

wherein in the case that the first node is operating at the firsttransmission mode, the measuring includes measuring the first channelbusy ratio for the control channel resource pool for the firsttransmission mode and measuring the second channel busy ratio for thedata channel resource pool for the first transmission mode.

(40), The system according to (38), wherein, the different transmissionmodes include a first transmission mode and a second transmission mode,

wherein the measuring includes measuring the first channel busy ratiofor the control channel resource pool for the second transmission modeand measuring the second channel busy ratio for the data channelresource pool for the second transmission mode.

(41). The system according to (36), wherein, in the case that the radiosignal is of a plurality of carriers, the measuring includes measuringthe channel busy ratios for the different types of channel resourcepools for each carrier.

(42). The system according to (36), wherein, in the case that one ormore of the channel busy ratios exceed a predetermined threshold, theperforming includes transmitting radio signal not in unoccupiedresources in one or more of the different types of channel resourcepools corresponding to the one or more of the channel busy ratios.

(43). The system according to (42), wherein, the performing includes oneor more of:

transmitting radio signal in occupied resources for data with a prioritylower than a priority of the radio signal to be transmitted;transmitting radio signal in occupied resources by dropping dataoccupying the occupied resources;transmitting radio signal by adjusting radio parameters for the radiosignal; anddelaying a predetermined time to transmit radio signal.

(44). The system according to (43), wherein, the radio parameters forthe radio signal include one or more of power and number oftransmissions of a transport block.

(45). The system according to (36), wherein, in the case that one ormore of the channel busy ratios do not exceed a predetermined threshold,the performing includes transmitting radio signal in unoccupiedresources in the one or more of the different types of channel resourcepools corresponding to the one or more of the channel busy ratios.

(46). The system according to (36), wherein, the method furthercomprises reporting the measured channel busy ratios to a second node,wherein the first node is a user equipment, and the second node is abase station.

(47), The system according to (46), wherein, the method furthercomprises reporting the measured channel busy ratios to the second nodein response to one of the following conditions:

a predetermined period elapses;at least one of the measured channel busy ratios exceeds a predeterminedthreshold; orthe reporting is triggered by the base station.

(48). The system according to (36), wherein, the measuring includesmeasuring channel busy ratios (CBRs) by calculating a ratio of occupiednumber of resources to a total number of resources,

wherein, the occupied number of resources indicates a number ofcalculation units of radio signal which have powers larger than athreshold, and the total number of resources indicates a total number ofthe calculation units of radio signal.

(49). The system according to (48), wherein, the calculation units ofradio signal include one or more physical resource blocks, or one ormore resource block groups, and wherein the powers include radio signalpower strength, or power spectrum density.

(50). The system according to (37), wherein the control channel resourcepool includes a Physical Sidelink Control Channel (PSCCH) resource pool,and the data channel resource pool includes a Physical Sidelink SharedChannel (PSSCH) resource pool.

(51). The method according to (36), wherein the first node is operatingat one of different transmission modes, and the measuring includesmeasure the channel busy ratios for the channel resource pools of theradio signal with respect to different transmission modes.

(52). The method according to (36), wherein in the case that the radiosignal is of a plurality of carriers, the measuring includes measuringthe channel busy ratios for the channel resource pools for each carrier.

The present disclosure can be realized by software, hardware, orsoftware in cooperation with hardware. Each functional block used in thedescription of each embodiment described above can be realized by an LSIas an integrated circuit, and each process described in the eachembodiment may be controlled by LSI. They may be individually formed aschips, or one chip may be formed so as to include a part or all of thefunctional blocks. They may include a data input and output coupledthereto. The LSI here may be referred to as an a system LSI, a superLSI, or an ultra LSI depending on a difference in the degree ofintegration. However, the technique of implementing an integratedcircuit is not limited to the LSI and may be realized by using adedicated circuit or a general-purpose processor. In addition, a FPGA(Field Programmable Gate Array) that can be programmed after themanufacture of the LSI or a reconfigurable processor in which theconnections and the settings of circuits cells disposed inside the LSIcan be reconfigured may be used.

Examples of several embodiments of the present disclosure have beendescribed in detail above, with reference to the attached illustrationsof specific embodiments. Because it is not possible, of course, todescribe every conceivable combination of components or techniques,those skilled in the art will appreciate that various modifications maybe made to the above described embodiments without departing from thescope of the present disclosure. For example, it will be readilyappreciated that although the above embodiments are described withreference to parts of a 3GPP network, an embodiment of the presentdisclosure will also be applicable to like networks, such as a successorof the 3GPP network, having like functional components.

Therefore, in particular, the terms 3GPP and associated or related termsused in the above description and in the enclosed drawings and anyappended claims now or in the future are to be interpreted accordingly.

The present disclosure can be realized by software, hardware, orsoftware in cooperation with hardware. Each functional block used in thedescription of each embodiment described above can be realized by an LSIas an integrated circuit, and each process described in the eachembodiment may be controlled by LSI. They may be individually formed aschips, or one chip may be formed so as to include a part or all of thefunctional blocks. They may include a data input and output coupledthereto. The LSI here may be referred to as an IC, a system LSI, a superLSI, or an ultra LSI depending on a difference in the degree ofintegration. However, the technique of implementing an integratedcircuit is not limited to the LSI and may be realized by using adedicated circuit or a general-purpose processor. In addition, a FPGA(Field Programmable Gate Array) that can be programmed after themanufacture of the LSI or a reconfigurable processor in which theconnections and the settings of circuits cells disposed inside the LSIcan be reconfigured may be used.

Notably, modifications and other embodiments of the discloseddisclosure(s) will come to mind to one skilled in the art having thebenefit of the teachings presented in the foregoing descriptions and theassociated drawings. Therefore, it is to be understood that thedisclosure(s) is/are not to be limited to the specific embodimentsdisclosed and that modifications and other embodiments are intended tobe included within the scope of this disclosure. Although specific termsmay be employed herein, they are used in a generic and descriptive senseonly and not for purposes of limitation.

1-20. (canceled)
 21. A first communication apparatus, comprising:circuitry, which, in operation, measures one or more channel busy ratiosfor resource pool(s), a transmitter, which, in operation, reports themeasured one or more channel busy ratios to a base station.
 22. Thefirst communication apparatus according to claim 21, wherein, the one ormore channel busy ratios includes one or more channel busy ratiosrelating to a data channel and one or more channel busy ratio relatingto a control channel.
 23. The first communication apparatus according toclaim 21, wherein, the one or more channel busy ratios includes one ormore channel busy ratios relating to Physical Sidelink Shared Channel(PSSCH) and one or more channel busy ratios relating to a PhysicalSidelink Control Channel (PSCCH).
 24. The first communication apparatusaccording to claim 21, wherein, the one or more channel busy ratiosincludes a first channel busy ratio relating to a first type of achannel resource pool and a second channel busy ratio relating to asecond type of a channel resource pool.
 25. The first communicationapparatus according to claim 21, wherein, the one or more channel busyratios includes a first channel busy ratio relating to a firsttransmission mode in which the base station schedules resources.
 26. Thefirst communication apparatus according to claim 25, wherein, the one ormore channel busy ratios includes a second channel busy ratio relatingto a second transmission mode in which the first communication apparatusautonomously schedules resources.
 27. The first communication apparatusaccording to claim 21, wherein, the one or more channel busy ratios aremeasured per a component carrier.
 28. The first communication apparatusaccording to claim 21, wherein, the transmitter, in operation, transmitsa radio signal to a third communication apparatus by adjusting radioparameters including power and a number of transmissions of a transportblock based on the one or more channel busy ratios.
 29. The firstcommunication apparatus according to claim 21, wherein, the report ofthe measured one or more channel busy ratios is triggered by an event.30. The first communication apparatus according to claim 21, wherein,the measured one or more channel busy ratios is reported periodically.31. The first communication apparatus according to claim 21, wherein,each of the one or more channel busy ratios indicates a ratio of anumber of resources which exceed a threshold to a total number ofresources.
 32. The first communication apparatus according to claim 21,wherein, each of the one or more channel busy ratios is calculated for aplurality of Physical Resource Blocks (PRBs).
 33. A first communicationapparatus comprising: circuitry, which, in operation, measures one ormore channel busy ratios for resource pool(s), a transmitter, which, inoperation, determines whether to transmit a radio signal to a secondcommunication apparatus based on a measurement result of the one or morechannel busy ratios.
 34. A communication method comprising: measuringone or more channel busy ratios for resource pool(s), reporting themeasured one or more channel busy ratios to a base station.
 35. Acommunication method comprising: measuring one or more channel busyratios for resource pool(s), determining whether to transmit a radiosignal to a second communication apparatus based on a measurement resultof the one or more channel busy ratios.